Question

U TUNC
12)
The size of a pencil is 12 cm. Faisal observes its image in a mirror given to
him. The length of the image is 24 cm and the image is erect. He is having a
mirror.
a) Plane mirror
b) Concave mirror
c) Convex mirror
d) None
13) The size of a pencil is 12 cm. Faisal observes its image in a mirror given to
him. The length of the image is 12 cm and the image is erect. He is having a
mirror.
a) Plane mirror
b) Concave mirror
c) Convex mirror
d) None​

Answer 1

1:c

2:a

Explanation:

FIRST CASE:

SIZE OF PENCIL NORMALLY=12CM

FAISAL OBSERVES SIZE OF PENCIL IN Mirror=24CM

FEATURES OF IMAGE:

IMAGE IS ERECT AND MAGNIFIED.

ERECT-GIVEN

MAGNIFIED- AS SIZE OF IMAGE IS GREATER THAN SIZE OF OBJECT.

THE MIRROR WHICH FORMS ERECT AND MAGNIFIED IMAGE IS CONVEX MIRROR.

HENCE OPTION (C)

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SECOND CASE:

SIZE OF PENCIL NORMALLY=12CM

FAISLA OBSERVES SIZE OF PENCIL IN MIRROR=12CM

FEATURES OF IMAGE:

ERECT-GIVEN

SAME SIZE AS THAT OF OBJECT-AS HEIGHT OF IMAGE = HEIGHT OF OBJECT.

THE MIRROR WHICH FORMS ERECT AND SAME SIZE AS THAT OF OBJECT IMAGE IS PLANE MIRROR.

HENCE OPTION(A)

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BY SCIVIBHANSHU

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